2. Takers - who step in the circle, promote their concern and take a discussion along to a result.

3. Timebox - normally the boundaries in the 3D Open Space. Here we open virtual space and need to define date and time as explicitly, and across planetary time zones, if we keep the chat format. A variant could be a whole weekday (48 planetary hours) which reduces intensity (the firehose effect) and may allow for more research to enter the responses.

4. Twitter chat - the #hashtag defines a virtual space to join the participants. Or, in the variant version a blog or other durable medium that can be found, filtered and focused to fortify the findings.

Tweets on timeline - great for inspiration of the moment, but they vanish, hard to reference and refine to build upon. Chat archives help, but come back to life as useful only with some curation or markup of where the interest converges.

Facebook posts and comments - a little larger than tweets, easier to search when posted in a group, yet essentially disposable dialog in a walled garden. Harder to curate than tweets.

Google+ posts and comments - in some respects better to re-use than conributions lost in the facebooks of this world. Can link to public posts but cannot link to comments or thread them, either.

Which makes traditional discussion forums appear really useful again. Mature technology. They preserve the dialog truthfully, but are as remote from curation as the choices above to make prior art re-usable.

Curation tools like scoop.it make it easier for master curators to feed their selected topics to the world, but I have yet to see a simple collaborative curation tool that helps a community know each other and build trust.

Looks like if we all learn to wiki as well as we tweet, we can turn the co-creative person-hours joyfully donated to a #chat into a basis for re-usable references and curated work.